CHAPTER : INTEGRATION Content pge Concept Mp 4. Integrtion of Algeric Functions 4 Eercise A 5 4. The Eqution of Curve from Functions of Grdients. 6 Ee
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1 ADDITIONAL MATHEMATICS FORM 5 MODULE 4 INTEGRATION
2 CHAPTER : INTEGRATION Content pge Concept Mp 4. Integrtion of Algeric Functions 4 Eercise A 5 4. The Eqution of Curve from Functions of Grdients. 6 Eercise B 7 SPM Question 8 9 Assessment Answer
3 n n c ). d = = + d c n + n + Indefinite Integrl ò ) d = + c. n+ n ) ò d = + c. n + ò ò Integrtion of Algeric Functions ò [ ± ] = ò ± ò e) d) The Eqution f ( ) g( ) ofd Curve f ( from ) d g( ) Functions of Grdients ò y = f '( ) d y = f ( ) + c,
4 INTEGRATION. Integrtion is the reverse process of differentition. dy. If y is function of nd = f '( ) then '( ) = +, = constnt. d ò f d y c c dy If = f ( ), then ò f ( ) d = y d 4.. Integrtion of Algeric Functions Indefinite Integrl ò ) d = + c. nd c re constnts n+ n ) ò d = + c. n + c is constnt, n is n integer nd n - ò n+ n n ò c) d = d = + c. n + nd c re constnts n is n ò [ ± ] = ò ± ò d) f ( ) g( ) d f ( ) d g( ) d
5 Find the indefinite integrl for ech of the following. ) 5 d ) d 5 c) d d) ( ) d Alwys rememer to include +c in your nswers of indefinite integrls. Solution : 4 = c 4 ) 5d 5 c ) d c d) 5 ( ) d d d 6 = c = c 6 6 = c = c 5 5 c) d c Find the indefinite integrl for ech of the following. 4 ) d ) d 4 4 Solution : ) d d d = c = c 4 4 ) d = d 4 = 4 d = 4 c 4 = c 4
6 . Find 4 d. [m]. Find d. [m]. Find d. [m] 4. Find d. 4 [m] Integrte with respect to. [m] 6. Find d [m] 7. Find 6 d 6. [m] 8. Integrte with respect to. [m] 5
7 The Eqution of Curve from Functions of Grdients dy If the grdient function of the curve is f '( ), d then the eqution of the curve is y f '( ) d y f ( ) c, c is constnt. Find the eqution of the curve tht hs the grdient function nd psses through the point (, ). Solution The grdient function is. dy d y ( ) d y c The curve psses through the point(, ). Thus, =, y=. () c 6 4 c c 5 Hence, the eqution of curve is y 5 6
8 dy. Given tht 6, epress y in terms of if y = 9 when =. d. Given the grdient function of curve is 4. Find the eqution of the curve if it psses through the point (, 6). dy 48. The grdient function of curve is given y k, where k is constnt. d Given tht the tngent to the curve t the point (-, 4) is prllel to the -is, find the eqution of the curve. 7
9 SPM - Pper :Question () dy Given tht nd y = 6 when =, find y in terms of. [ mrks] d SPM 4- Pper :Question 5() The grdient function of curve which psses through A(, ) is eqution of the curve. 6. Find the [ mrks] 8
10 SPM 5- Pper :Question A curve hs grdient function p 4, where p is constnt. The tngent to the curve t the point (, ) is prllel to the stright line y + 5 =. Find () the vlue of p, [ mrks] () the eqution of the curve. [ mrks] 9
11 . Find the indefinite integrl for ech of the following. 6 d d () 4 () ( c) 6 5 (c) + d (d) 5 d. If dy d 4 4, nd y = when =, find y in terms of.
12 . If dp dv v v, nd p = when v =, find the vlue of p when v =. 4. Find the eqution of the curve with grdient origin., which psses through the 5. Given tht of. d y dy dy 4, nd tht, y = when =. Find d d d nd y in terms
13 EXERCISE A ) c ) ) 4 c 4 4 c 4) 5) 6) c 4 c 7) c 8) c EXERCISE B ) y ) y 4 ) y SPM QUESTIONS ) y 7 ) y ) p, y 4 ASSESSMENT c ( ) ( c) c c ( d) 9 6 c 4 ) ( ) 4 ) y 8 7 ) p 8 4) y 5) y
14 ADDITIONAL MATHEMATICS FORM 5 MODULE 5 INTEGRATION
15 CONTENT CONCEPT MAP INTEGRATION BY SUBSTITUTION DEFINITE INTEGRALS 5 EXERCISE A 6 EXERCISE B 7 ASSESSMENT 8 SPM QUESTIOS 9 ANSWERS 4
16 CONCEPT MAP INTEGRATION BY SUBSTITUTION u n d du where u = +, nd re constnts, n is n integer nd n - n OR n n d c, n where,, nd c re constnts, n is integer nd n - DEFINITE INTEGRALS d If g ( ) f ( ) then d () f( ) d g( ) g( ) g( ) ( ) f( ) d f( ) d c c ( c) f( ) d f( ) d f( ) d 5
17 INTEGRATION BY SUBSTITUTION u n d du where u = +, nd re constnts, n is n integer nd n - n O R n n d c, n where,, nd c re constnts, n is integer nd n - Find the indefinite integrl for ech of the following. () d 7 () 4( 5) d (c) (5 ) d SOLUTION () d Let u = + du du d d du ( ) d u u = du u = c ( ) Sustitute + nd sustitute d with du d = OR ( ) (4) 4 d c ( ) = 8 4 c 4 u = + c 8 ( ) = + c 8 Sustitute u = + 6
18 () 7 4( 5) d Let u 5 du du d d 7 7 4u 4( 5) d du 8 4u = c (8) OR 8 u = c 6 (u 5) = 6 8 c (c) (5 ) d (5 ) d Let u 5 du du 5 d d 5 u (5 ) d du 5 u = c 5( ) u = c 5 = 5u = c 5(5 ) 4( 5) (8) 8 7 d c 4( 5) 8 ( 5) = c 6 DEFINITE INTEGRALS d If g ( ) f ( ) then d () f ( ) d g( ) g( ) g( ) ( ) f ( ) d f ( ) d c c ( c) f ( ) d f ( ) d f ( ) d 7
19 Evlute ech of the following ( )( ) () d 4 () ( ) d SOLUTION () ( )( ) 9 c 4 d 4 9 = d 4 4 = ( 9 ) d 4 = 9 = = = ( ) 8 = 8 = 8 () ( ) d ( ) d = ( ) ( ) = () d = ( ) = [() ] [() ] = 6 = 8
20 EXERCISE A INTEGRATE THE FOLLOWING USING SUBSTITUTION METHOD. () ( ) d () d () 5 d 4 (4) 5 d (5) 5 4 y dy 4 (6) 5 u du 5 9
21 EXERCISE B. Evlute 8 ( 4) d Answer : Evlute ( 5) d 8 Answer: Integrte 5 with respect to Answer: 5 c Evlute d 4 Answer : 5. Evlute Answer: d 6.Given tht of f ( ) d 5 Answer :7 5 f ( ) d, find the vlue
22 ASSESSMENT. Given tht f ( ) d 7. Find f ( ) d () () 5 f ( ) d the vlue of k if k f ( ) d 8 nd.() 5( v) 4 () dv d Answer : () k = () 48. Show tht Hence, find the vlue of Answer : d d 6 d.. 4. Given tht 4 g( ) d 5. Find 4 () 4 4 () f ( ) ( ) f ( ) d g( ) d Answer: () 5 () 4 g d 4 f ( ) d nd
23 SPM QUESTIONS SPM PAPER, QUESTION 7.Given tht 5 n d k 4 c, find the vlue of k nd n [ mrks] 5 Answer: k = n = - SPM 4 PAPER, QUESTION k. Given tht d 6, where k > -, find the vlue of k. [4 mrks] Answer: k = 5 SPM 5 PAPER, QUESTION. Given tht 6 f ( ) d 7 nd 6 ( f ( ) k) d, find the vlue of k. Answer: k = 4
24 ANSWERS EXERCISE A. ( + ) 4 + c. 6 ( +5) c. c c y c u c 6 EXERCISE B c ASSESSMENT. () k = () 48. () 9( v) -5 +c () ( 5 ) 4 c SPM QUESTIONS 5. k = n = -. k = 5. k = () 5 () 4
25 ADDITIONAL MATHEMATICS MODULE 6 INTEGRATION 4
26 CHAPTER : INTEGRATION Content pge Concept Mp 9. Integrtion s Summtion of Ares Eercise A Integrtion s Summtion of Volumes 7 8 Eercise B 9 SPM Question 4 Answer 5 5
27 ) The re under curve which enclosed y -is, = nd = is y d ) The re under curve which enclosed y y-is, y = nd y = is dy c) The re enclosed y curve nd stright line f ( ) g( ) d ) The volume generted when curve is rotted through 6º out the -is is V y d ) The volume generted when curve is rotted through 6º out the y-is is V y dy 6
28 . INTEGRATION. Integrtion s Summtion of Are y = f() y y = f() The re under curve which enclosed y = nd = is yd Note : The re is preceded y negtive sign if the region lies elow the is. The re under curve which is enclosed y y = nd y = is dy Note : The re is preceded y negtive sign if the region is to the left of the y is. The re enclosed y curve nd stright line y y = g () y = f () The re of the shded region = f ( ) d g( ) = f ( ) ( ) g d 7
29 . Find the re of the shded region in the digrm. y y =. Find the re of the shded region in the digrm. y y =
30 . Find the re of the shded region 4. Find the re of the shded region in the digrm. y y y = y = = y - - 9
31 5. Find the re of the shded region in the digrm y 6. y y = ( ) = y - y = k - Given tht the re of the shded region in the digrm ove is 8 units. Find the vlue of k.
32 . Integrtion s Summtion of Volumes y y=f() The volume generted when curve is rotted through 6º out the -is is V y d y y=f() The volume generted when curve is rotted through 6º out the y-is is V y dy
33 y y=(+) Find the volume generted when the shded region is rotted through 6º out the -is. Answer : = Volume generted y d d 4 ( ) d () units. Answer : Given y 6 y y 6 sustitute into y 6 Then, y 6 y 6 Volume generted The figure shows the shded region tht is enclosed y the curve y 6, the -is nd the y-is. Clculte the volume generted when the shded region is revolved through 6º out y-is. 6 dy 6 6 y d y 6y 6 6(6) 8 units. 6
34 . y y = ( ) The ove figure shows the shded region tht is enclosed y the curve y = ( ) nd -is. Clculte the volume generted when the shded region is revolved through 6º out the y-is. [4 mrks]
35 . y R (, 4) Q (, 4) P (, ) y² = 4 ( + ) = The figure shows the curve y ( ). Clculte the volume generted when the shded region is revolved through 6º out the -is. 4
36 . y R (, 4) y = k The ove figure shows prt of the curve y nd the stright line = k. If the volume generted when the shded region is revolved through 6º out the -is is units, find the vlue of k. 5
37 y SPM - Pper :Question 9 () Digrm shows curve y which intersects the stright line y t point A. y y y Digrm Clculte the volume generted when the shded region is involved 6º out the y-is. [6 mrks] 6
38 SPM 4- Pper :Question Digrm 5 shows prt of the curve y y which psses through A(, ). A(,) Digrm 5 y ) Find the eqution of the tngent to the curve t the point A. [4 mrks] ) A region is ounded y the curve, the -is nd the stright lines = nd =. i) Find the re of the region. ii) The region is revolved through 6º out the -is. Find the volume generted, in terms of. [6 mrks] 7
39 SPM 5- Pper :Question In Digrm 4, the stright line PQ is norml to the curve stright line AR is prllel to the y-is. y y y t A(, ). The A(, ) Q(k, ) R Digrm 4 Find () the vlue of k, [ mrks] () the re of the shded region, [4 mrks] (c) the volume generted, in terms of, when the region ounded y the curve, the y-is nd the stright line y = is revolved through 6º out y-is. [ mrks] 8
40 EXERCISE A. units 5. units 6. units 4. 4 units 5. units 6. k 4 EXERCISE B. unit 5. 6 unit 5. k SPM QUESTIONS SPM 5 Volume Generted units 5 SPM 4 i) Are units 5 ii) 49 Volume Generted units 5 SPM 5 ) k 8 ) Are units c) Volume Generted 4 units 9
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